I am wondering if there is a way to input a connectivity matrix (ie:a CSV file with source,destination IPs and destination ports) into Netbrain and get an answer for each individual flow if they are allowed through a certain firewall or not.
I know that there are other applications out there written exactly for the above described function, but I am wondering if Netbrain is capable of something similar.

Unfortunately, NetBrain does not have a build-in tool which could check the connectivity by input a matrix automatically.
But NetBrain has the AB path function which could be used to verify the connectivity between 2 endpoints and we have to manually input the Source and Destination IP addresses one by one to calculate the path.
Please kindly refer to this online help guide for the path function:
https://www.netbraintech.com/ftp/EE62/OnlineHelp/index.html?mapping_an_application_path.htm